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Finding the Fourth Proportional to 501.15, 690.60 and 407.59

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Solution

The fourth proportional to 501.15, 690.60 and 407.59 is: 561.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    501.15 : 690.60 = 407.59 : x
  2. Step 2: Convert to fraction form
    501.15/690.60 = 407.59/x
  3. Step 3: Cross multiply
    501.15x = 690.60 × 407.59
  4. Step 4: Simplify right side
    501.15x = 281,481.65
  5. Step 5: Solve for x
    x = 281,481.65/501.15
  6. Step 6: Final answer
    x = 561.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.